Number of compositions of n whose negation is not unimodal.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =11a(7) =28a(8) =71a(9) =165a(10) =372a(11) =807a(12) =1725a(13) =3611a(14) =7481a(15) =15345a(16) =31274a(17) =63392a(18) =128040a(19) =257865a(20) =518318a(21) =1040277a(22) =2085714a(23) =4178596a(24) =8367205a(25) =16748151a(26) =33515214a(27) =67056139a(28) =134147231a(29) =268341515